Libtayo (cemiplimab) is a human antibody that targets PD-1 (PDCD1) and prevents interaction with PD-L1 (CD274) and PD-L2 (PDCD1LG2), potentially resulting in increased anti-tumor immune response and decreased tumor growth (PMID: 28265006). Libtayo (cemiplimab) is FDA approved for use in patients with cutaneous squamous cell carcinoma, who are not not eligible for curative surgery or radiation (FDA.gov).